May 2016: A800-AM19-4 - Currently used in the rear of a kit. With AM19-4 the top link effective length is 0,7mm shorter compare to AM19-2. Also with AM19-4 the flex of suspension is smaller ( similar to more stiffer arm and c-hub of normal cars). The screws on dampers are more accessible for adjustment.

January 2017 - SPRO2X - new for dampers and do not require a 98 degree bent spring.

January 2017 - New A800X and A800XA kits now available featuring 0.3mm longer front and rear wheelbase.

Kit Updates

May - Current: Kits now including DT10-2-1 bearing holders for increased side play and durability of the differential and spool.

1. Will + caster (lean back similar to front) under compression introduce linear or non-linear toe in as spindle moves upward and backward(?) simultaneously and what is the effect?

2. If toe-in rear under compression, will have camber curves similar to steering? If we turn right, the left rear will compress (initiate toe in), but same time the caster will introduce a negative camber to the tire as well while being compressed. Hence ability keep the tire camber relatively flat/stable?

While these may be small, on the track it might be significant tuning aid especially when tire is approaching limit (traction roll or slide)?

Thoughts or on-track experience?

P.S. Someone lent me an Awesomatix. Want to be clear in my mind how to tune rear caster before hitting the track. Thanks.

Thanks. I'm ok with how to physically set links for toe in/out and adjust wheelbase. Trying to understand the tuning possibilities of rear caster.
With rear caster two planes of tire movement is introduced allowing more tuning possibilities:
1. Camber curve ( with no toe movement)
2. Toe (and scrub)3. Camber curve (as with toe movement and caster effect)4. Front to back movement
Surprised the manual only talks about using rear caster for wheelbase adjustment when the tire can move in more planes (and be tuned accordingly).

[QUOTE=rccartips;15323535]Thanks. I'm ok with how to physically set links for toe in/out and adjust wheelbase. Trying to understand the tuning possibilities of rear caster.
With rear caster two planes of tire movement is introduced allowing more tuning possibilities:
1. Camber curve ( with no toe movement)
2. Toe (and scrub)3. Camber curve (as with toe movement and caster effect)4. Front to back movement
Surprised the manual only talks about using rear caster for wheelbase adjustment when the tire can move in more planes (an be tuned accordingly).

The main effect felt by the change is wheelbase. The toe is set by the toe link. You need to change the bump toe shims with the caster to hold the same bump toe setting but other than this there is no effect from the caster. There may be other changes but they are negligible compared to wheelbase and the effect is has on the car.

4*of caster is 1mm if wheelbase, and you need 1.75mm of toe shims every 4* to hold the same bump toe setting

Thanks. I'm ok with how to physically set links for toe in/out and adjust wheelbase. Trying to understand the tuning possibilities of rear caster.
With rear caster two planes of tire movement is introduced allowing more tuning possibilities:
1. Camber curve ( with no toe movement)
2. Toe (and scrub)3. Camber curve (as with toe movement and caster effect)4. Front to back movement
Surprised the manual only talks about using rear caster for wheelbase adjustment when the tire can move in more planes (an be tuned accordingly).

The main effect felt by the change is wheelbase. The toe is set by the toe link. You need to change the bump toe shims with the caster to hold the same bump toe setting but other than this there is no effect from the caster. There may be other changes but they are negligible compared to wheelbase and the effect is has on the car.

4*of caster is 1mm if wheelbase, and you need 1.75mm of toe shims every 4* to hold the same bump toe setting

Will just continue to think about it as I remember the Trinity Reflex front suspension (whose benefit was active camber, not wheelbase change). Now that front suspension is on the rear as well, I am exploring possibility that effect is more on camber curves, tire inclination due to caster as it toes in and how it puts pressure on the road, rather than 1mm wheelbase difference.

Again thanks for the inputs. Being RCTECH, just wanted to discuss the technical possibilities of rear caster apart from wheelbase.

To comparing TC isn't important , you can take ten person to drive the same car and not everyone going to agree the same answer.. everybody drive different But you have to learn to set up the TC just the way you like or feel perfect for your driving skill
the key is to get your TC adapt to you driving styles
yes some TC can feel different than other...

For me both are good, but durability (in terms of maintenance) the Awesomatix is better. Xray develops lots of slop after a few races, and with Xray flex chassis (lower cf chassis) as main tuning design, will probably need to replace chassis often or keep changing setup to compensate for the ever degrading Xray chassis. I recall Xray drivers saying they replace chassis every 3 races (but probably every race).

Setup option, Awesomatix also has advantage of triangular upper links. Plus a shock/spring that you can move back/forth to change stiffness rather than replace/test lots of coil springs.

The T4 is a great car you can just pick up and run and be competitive, it's tough and parts are everywhere and there is a massive knowledge base for it. The A800X is probably a bit more advanced, needs more work continually and while some say it's more durable, I beg to differ on that, parts are harder to find and far more expensive as well. Noted weak points I have found are carbon arms in general, and the bottom chassis plate is fragile on the back where the AT21 ball stud bolts on for the rear arms, a glancing blow on the back of the chassis and it's not uncommon to just kill a bottom deck as the whole back corner tweaks. (Leverage of the arms on a single point would contribute to this as well)

TWorks makes a titanium set for the A800X that works awesome. They make the 5mm balls in titanium too. I'll have more next week.

EA

ive had two cars both with tworks titanium balls. The 4.8mm ones are great. The 5mm bind the arms up so bad you canít use them. Donít know if I got two bad batches or what. Mike H. said heís aware of it.

ive had two cars both with tworks titanium balls. The 4.8mm ones are great. The 5mm bind the arms up so bad you canít use them. Donít know if I got two bad batches or what. Mike H. said heís aware of it.

Somewhat fake news... I don't know about any twork issue

It's always smart to compare/check ball sizes when changing them. I usually have Bill Sydor verify my balls for me